310 research outputs found
Metallic Pattern Fabrication in Organic Mott Insulating Crystal by Local X-Ray Irradiation
We have fabricated a metallic structure in an organic Mott insulator
-(BEDT-TTF)Cu[N(CN)]Cl. The periodic metallic domains of
approximately 9090 m obtained by X-ray irradiation through a
molybdenum mesh mask are visualized by scanning microregion infrared
reflectance spectroscopy technique. No deterioration by irradiation is found in
a range of nanometer to micrometer scales. We demonstrate that the present
processing method is applicable for the fabrication of molecular electronic
devices.Comment: 3 pages, submitted to APE
High-fidelity conversion of photonic quantum information to telecommunication wavelength with superconducting single-photon detectors
We experimentally demonstrate a high-fidelity visible-to-telecommunication
wavelength conversion of a photon by using a solid-state-based difference
frequency generation. In the experiment, one half of a pico-second visible
entangled photon pair at 780 nm is converted to a 1522-nm photon, resulting in
the entangled photon pair between 780 nm and 1522 nm. Using superconducting
single-photon detectors with low dark count rates and small timing jitters, we
selectively observed well-defined temporal modes containing the two photons. We
achieved a fidelity of after the wavelength conversion,
indicating that our solid-state-based scheme can be used for faithful frequency
down-conversion of visible photons emitted from quantum memories composed of
various media.Comment: 5 pages, 4 figure
Multi-channel SNSPD system with high detection efficiency at telecommunication wavelength
We developed a four-channel superconducting nanowire single-photon detector
system based on a Gifford-McMahon cryocooler. All channels showed a system
detection efficiency (at a 100 Hz dark-count rate) higher than 16% at 1550 nm
wavelength, and the best channel showed a system DE of 21% and 30% at 1550 nm
and 1310 nm wavelength, respectively.Comment: 10 pages, 4 figure
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